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from collections import defaultdict
def check(w):
pairs = defaultdict(list)
rep = False
last2 = (None, None)
for i, c in enumerate(w):
if last2[1] is not None:
pairs[(last2[1], c)].append(i)
if not rep and last2[0] == c:
rep = True
last2 = (last2[1], c)
if not rep:
return False
for _, p in pairs.items():
if len(p) < 2:
continue
if len(p) > 2:
break
if p[1] - p[0] > 1:
break
else:
return False
return True
print(len([w for w in open('input') if check(w)]))
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